GNUInfo.h revision 87f34658dec9097d987d254a990ea7f311bfc95f 
1//===- GNUInfo.h ----------------------------------------------------------===//
2//
3//                     The MCLinker Project
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9#ifndef MCLD_TARGET_GNUINFO_H
10#define MCLD_TARGET_GNUINFO_H
11#ifdef ENABLE_UNITTEST
12#include <gtest.h>
13#endif
14#include <llvm/ADT/Triple.h>
15#include <llvm/Support/ELF.h>
16
17namespace mcld {
18
19/** \class GNUInfo
20 *  \brief GNUInfo records ELF-dependent and target-dependnet data fields
21 */
22class GNUInfo
23{
24public:
25  GNUInfo(const llvm::Triple& pTriple);
26
27  virtual ~GNUInfo() { }
28
29  /// ELFVersion - the value of e_ident[EI_VERSION]
30  virtual uint8_t ELFVersion() const { return llvm::ELF::EV_CURRENT; }
31
32  /// The return value of machine() it the same as e_machine in the ELF header
33  virtual uint32_t machine() const = 0;
34
35  /// OSABI - the value of e_ident[EI_OSABI]
36  uint8_t OSABI() const;
37
38  /// ABIVersion - the value of e_ident[EI_ABIVRESION]
39  virtual uint8_t ABIVersion() const { return 0x0; }
40
41  /// defaultTextSegmentAddr - target should specify its own default start address
42  /// of the text segment. esp. for exec.
43  virtual uint64_t defaultTextSegmentAddr() const { return 0x0; }
44
45  /// flags - the value of ElfXX_Ehdr::e_flags
46  virtual uint64_t flags() const = 0;
47
48  /// entry - the symbol name of the entry point
49  virtual const char* entry() const { return "_start"; }
50
51  /// dyld - the name of the default dynamic linker
52  /// target may override this function if needed.
53  /// @ref gnu ld, bfd/elf32-i386.c:521
54  virtual const char* dyld() const { return "/usr/lib/libc.so.1"; }
55
56  /// isDefaultExecStack - target should specify whether the stack is default
57  /// executable. If target favors another choice, please override this function
58  virtual bool isDefaultExecStack() const { return true; }
59
60  /// commonPageSize - the common page size of the target machine, and we set it
61  /// to 4K here. If target favors the different size, please override this
62  virtual uint64_t commonPageSize() const { return 0x1000; }
63
64  /// abiPageSize - the abi page size of the target machine, and we set it to 4K
65  /// here. If target favors the different size, please override this function
66  virtual uint64_t abiPageSize() const { return 0x1000; }
67
68protected:
69  const llvm::Triple& m_Triple;
70};
71
72} // namespace of mcld
73
74#endif
75
76